Everybody here is correct.... from wiring with relays, installing A body motors, cleaning your originals, and the time / labor to do these things. Sooo... how about a newer option. The Window Turbo. Don't know what's inside the "magic box", but I assume it's a voltage amplifier??? I have not ordered it yet, but it gets good reviews from what I have read. It's on my do-do list. Check it out.
https://proraceeng.com/wt140-window-turbo/
That looks like you would just splice that in-line, correct? For $8, I think someone needs to try that, and let us know how it works out.